/*
*  Copyright (c) 2001 Sun Microsystems, Inc.  All rights
*  reserved.
*
*  Redistribution and use in source and binary forms, with or without
*  modification, are permitted provided that the following conditions
*  are met:
*
*  1. Redistributions of source code must retain the above copyright
*  notice, this list of conditions and the following disclaimer.
*
*  2. Redistributions in binary form must reproduce the above copyright
*  notice, this list of conditions and the following discalimer in
*  the documentation and/or other materials provided with the
*  distribution.
*
*  3. The end-user documentation included with the redistribution,
*  if any, must include the following acknowledgment:
*  "This product includes software developed by the
*  Sun Microsystems, Inc. for Project JXTA."
*  Alternately, this acknowledgment may appear in the software itself,
*  if and wherever such third-party acknowledgments normally appear.
*
*  4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA"
*  must not be used to endorse or promote products derived from this
*  software without prior written permission. For written
*  permission, please contact Project JXTA at http://www.jxta.org.
*
*  5. Products derived from this software may not be called "JXTA",
*  nor may "JXTA" appear in their name, without prior written
*  permission of Sun.
*
*  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
*  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
*  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
*  DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
*  ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
*  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
*  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
*  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
*  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
*  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
*  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
*  SUCH DAMAGE.
*  ====================================================================
*
*  This software consists of voluntary contributions made by many
*  individuals on behalf of Project JXTA.  For more
*  information on Project JXTA, please see
*  <http://www.jxta.org/>.
*
*  This license is based on the BSD license adopted by the Apache Foundation.
*
*  $Id: PrePostList.java,v 1.2 2006/06/12 20:45:23 nano Exp $
*/

package net.jxta.myjxta.misc.eliza;

import java.util.Vector;

/**
 *  Eliza prePost list.
 *  This list of pre-post entries is used to perform word transformations
 *  prior to or after other processing.
 */
public class PrePostList extends Vector<PrePost> {

    /**
     *  Add another entry to the list.
     */
    public void add(String src, String dest) {
        addElement(new PrePost(src, dest));
    }

    /**
     *  Prnt the pre-post list.
     */
    public void print(int indent) {
        for (int i = 0; i < size(); i++) {
            PrePost p = (PrePost)elementAt(i);
            p.print(indent);
        }
    }

    /**
     *  Translate a string.
     *  If str matches a src string on the list,
     *  return he corresponding dest.
     *  If no match, return the input.
     */
    String xlate(String str) {
        for (int i = 0; i < size(); i++) {
            PrePost p = (PrePost)elementAt(i);
            if (str.equals(p.src())) {
                return p.dest();
            }
        }
        return str;
    }

    /**
     *  Translate a string s.
     *  (1) Trim spaces off.
     *  (2) Break s into words.
     *  (3) For each word, substitute matching src word with dest.
     */
    public String translate(String s) {
        String lines[] = new String[2];
        String work = EString.trim(s);
        s = "";
        while (EString.match(work, "* *", lines)) {
            s += xlate(lines[0]) + " ";
            work = EString.trim(lines[1]);
        }
        s += xlate(work);
        return s;
    }
}
